diff --git a/README b/README
index 100494a1ae..4ad5cfb8d2 100644
--- a/README
+++ b/README
@@ -214,7 +214,7 @@ To add a rule to a group:
 euca-authorize -P tcp -p 22 groupname
 
 To delete a rule from a group:
-euca-revoke <rule here> groupname
+euca-revoke -P tcp -p 22 groupname
 
 Notes:
 - Be careful removing or adding rules to existing groups b/c you could be